import Foundation

@MainActor
class FeedViewModel: ObservableObject {
    @Published var posts: [Post] = []
    @Published var isLoading = false

    func load() async {
        isLoading = true
        defer { isLoading = false }
        do {
            posts = try await supabase.getFeed()
        } catch {
            #if DEBUG
            posts = Post.previews
            #endif
        }
    }

    func resonate(_ post: Post) async {
        guard let idx = posts.firstIndex(where: { $0.id == post.id }) else { return }
        let wasActive = posts[idx].hasResonated

        posts[idx].hasResonated   = !wasActive
        posts[idx].resonanceCount += wasActive ? -1 : 1

        do {
            try await supabase.toggleResonance(postId: post.id, currentlyActive: wasActive)
        } catch {
            posts[idx].hasResonated   = wasActive
            posts[idx].resonanceCount += wasActive ? 1 : -1
        }
    }

    /// Neuen Post vom Realtime-Service in den Feed einfügen
    func prepend(_ post: Post) {
        guard !posts.contains(where: { $0.id == post.id }) else { return }
        posts.insert(post, at: 0)
    }
}